If you want to experiment with your options and see what happens and then start again, you might run into a little trouble.
Deleting the game and downloading/installing again might not work.
At least in Linux.
Saves are stored in game directory. Usually.
I do not know about other platforms but in Linux I got very weird results when deleting the game and starting over. It was just like old save and new session got mixed somehow. Some of the things I did before deleting everything was still remembered.
Turns out some data is also stored in your home directory in:
~/.renpy/Ambrosia's-<number>/
and
~/.renpy/persistent/playedambrosias.renpy.org
You do need to delete those also if you want to start over.